Side note on the STC-1000: I compared the temperature reading to a much more expensive instrument, and the STC-1000 was within 0.2C at room temperature. That's much better than I expected at this price.

oops, should have read the rest of the thread before posting. I see others have already pointed out the schematic errors.

Quote:

Originally Posted by lincoln

ether side would work, I put it inline with income power. I would use a 10 amp slow blow type, or a 12/14 amp regular blow. Motors have a significant in rush current that can burn a fast blow fuse.

Sorry gatorbite87, I'm going to take you to the wood shed over this. The point of a fuse is to prevent a fire when things don't "run perfectly" The outlet in your wall has at worst a 20 amp circuit breaker. The controller is rated for 10 amps. You need a fuse. Have you see this guy:

this is what I did:

basically there are two SSR one for each side (Heat / Cool) the ones I found were 40 amp but can be triggered by 12~24 vdc/ac The two diodes are 1 amp rectifiers. Ether heat or cool come on the fan will run and the diodes give (albeit lumpy) dc to a computer fan inside to keep air moving. If your SSR's can handle ac input adding a diode or 4 with a cap to the output of the transformer will make them happier.

what your looking for is called a process timer. I have one that i scrounged many years ago, just a quick look through ebay it don't look like it. there are other ones from omega and the like but the sellers want unreasonable amounts of money for them!!!! What range of timing are you looking for? What kind of outputs?

The relays on this diagram appear to me to be hooked up incorrectly. The coil and contacts seem to be reversed from what they should be.

Ok, so I got my temp controller built and it seems to be working good but I have one question. Can you drill into the side of a fridge? Just the old school fridge on bottom and freezer on top fridge. I want to mount my controller to the side of it but don't know if I will drill into lines and destroy my fridge. Any input would be helpful.